Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Chang, Yuan-Yi; Yan, Yeou-Lih; Tseng, Chwan-Lu; Syu, Jin-Yuan; Lin, Wen-Yinn; Yuan, Y. C.

doi:10.4209/aaqr.2011.11.0213

Cited by 7 publications

(8 citation statements)

References 54 publications

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“…An innovative de-NO x technology has also been developed by Yuan-Yi Chang et al using activated carbon in a circulating fluidized-bed reactor, with the adoption of microwaves for the regeneration of the activated carbon, with the aim of increasing the adsorption and destruction efficiency and decreasing the energy consumption [195]. The results of the study suggested that the MW process may be more effective than the traditional methods because an increase in the specific surface areas of activated carbon was found with the increase of MW power, generating an increase in NO x adsorption capacity and rate.…”

Section: Environmental Catalysismentioning

confidence: 99%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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Since the late 1980s, the scientific community has been attracted to microwave energy as an alternative method of heating, due to the advantages that this technology offers over conventional heating technologies. In fact, differently from these, the microwave heating mechanism is a volumetric process in which heat is generated within the material itself, and, consequently, it can be very rapid and selective. In this way, the microwave-susceptible material can absorb the energy embodied in the microwaves. Application of the microwave heating technique to a chemical process can lead to both a reduction in processing time as well as an increase in the production rate, which is obtained by enhancing the chemical reactions and results in energy saving. The synthesis and sintering of materials by means of microwave radiation has been used for more than 20 years, while, future challenges will be, among others, the development of processes that achieve lower greenhouse gas (e.g., CO 2 ) emissions and discover novel energy-saving catalyzed reactions. A natural choice in such efforts would be the combination of catalysis and microwave radiation. The main aim of this review is to give an overview of microwave applications in the heterogeneous catalysis, including the preparation of catalysts, as well as explore some selected microwave assisted catalytic reactions. The review is divided into three principal topics: (i) introduction to microwave chemistry and microwave materials processing; (ii) description of the loss mechanisms and microwave-specific effects in heterogeneous catalysis; and (iii) applications of microwaves in some selected chemical processes, including the preparation of heterogeneous catalysts.A chemical process is conventionally energized by means of conductive heating with a steam boiler as a typical heat source. Nevertheless, a large variety of other forms of energy can be applied for PI, including ultrasounds (for reactions or crystal nucleation), light (in photocatalytic processes), electric fields (in extraction or for orientation of molecules), or microwaves. The microwave (dielectric) heating of materials has been known for a long time, and microwave ovens have been developed from more than 60 years. The studies by Gedye et al. in 1986 and 1988 [3,4] opened a period of very intensive investigation of the microwave effects on chemical reactions in homogeneous systems. Since then, hundreds of research papers have been published, and research has also expanded toward heterogeneous catalysis and its related chemical processes. This review gives an overview of the application of microwave technology to heterogeneous catalysis, including various chemical processes, as well as to the preparation of catalysts.

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Section: Environmental Catalysismentioning

confidence: 99%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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“…Furthermore, combustion sources [4,5] and chemical processes [2] enhanced the N 2 O production [6][7][8][9]. There are numerous methods can be employed for N 2 O reduction which includes: thermal decomposition [10][11][12][13], selective adsorption [14][15][16], the application of microwave plasma technology [17][18][19], and catalytic destruction [20,21]. Among them, catalytic destruction has advantages compare to alternative technologies for controlling N 2 O emissions, for example, low energy costs when compared with thermal decomposition [22,23].…”

Section: Introductionmentioning

confidence: 99%

Decomposition of N₂O at low temperature over Co₃O₄ prepared by different methods

Inayat

Ayoub

Abdullah

et al. 2019

Env Prog and Sustain Energy

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The activity of Co3O4 prepared by different methods was examined for decomposition of N2O in the presence of 2% oxygen concentration. This N2O gas is also a part of NOx gases and it is also nominated as a greenhouse gas that is a big threat for future environment due to very stable compound and having long life many and more than CO2. It is very difficult to make unstable or decompose N2O compound especially at low temperature. Catalytical decomposition is ultimate way to convert N2O into environmental friendly gases. In the present study, Co3O4 was prepared by different methods and used as a catalyst for this purpose. In the preparation of Co3O4, three different methods were used namely sol–gel method (Co3O4‐S), calcination method (Co3O4‐C), and the co‐precipitation method (Co3O4‐P). The prepared materials were well characterized by TEM, TGA, XRD, and BET surface techniques. These three different preparation methods of Co3O4 were performed to optimize for N2O decomposition. The experimental results showed that the catalytic activities of Co3O4 strongly depended on the Na/Co molar ratio and pH of an alkaline solution during Co3O4 preparation other than reaction temperature and time parameters. The optimized catalyst 1% NaOH + 1 M NH4OH/Co3O4‐P was observed highly active at optimum pH value 9.8 and Na/Co molar ratio 0.0120. The highest activity of this optimized catalyst for N2O decomposition was found 98% at 400°C while 95%, 89%, 78%, and 68% were recorded at 350°C, 300°C, 250°C and 200°C, respectively. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13129, 2019

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“…The polarization causes the molecules to be at a higher energy state that brings about more impacts among the reactant molecules, and faster decomposition of pollutants occur (Zhang et al, 2007;Chang et al, 2012). The MW heating is based on using media with higher dielectric loss that is related to its own dipole orientation.…”

Section: Cb Removal Efficiency For Plain Cordierite With Mw Irradiationmentioning

confidence: 99%

“…Microwave (MW) is an electro-magnetic radiation with frequencies ranging from 300 MHz to 300 GHz (Chang et al, 2012;Woo, Grippin, Wu, & Wander, 2012). The MW absorbed by a solution will cause non-thermal effect to reduce the activation energy and weaken the chemical bonds of the organic chemicals (Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Microwave-induced Degradation of Chlorobenzene Using Fe0 and TiO2 Coated on Cordierites as Catalyst

Lee¹,

Jou²

2012

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In this research, MW is used to irradiate and induce Fe 0 /cordierite (Fe 0 coated cordierite particles) and TiO 2 /cordierite (TiO 2 coated cordierite particles) for improving the catalytic decomposition rate to remove chlorobenzene (CB) dissolved in aqueous solution. Laboratory results show that when 30 W of microwave energy is applied for 300 sec the irradiation of microwave than without microwave irradiation improves the CB removal efficiency by 3.2 times (57.4% vs. 18.2%) for Fe 0 /cordierite and 2.7 times (43.3% vs. 15.8%) for TiO 2 /cordierite. Hence, applying the microwave induced cordierite coated Fe 0 or TiO 2 particles is a new application that has been proved effective to remove chlorine-containing organic pollutants.

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Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Cited by 7 publications

References 54 publications

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Decomposition of N₂O at low temperature over Co₃O₄ prepared by different methods

Microwave-induced Degradation of Chlorobenzene Using Fe0 and TiO2 Coated on Cordierites as Catalyst

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Development of an Innovative Circulating Fluidized-Bed with Microwave System for Controlling NOx

Cited by 7 publications

References 54 publications

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Decomposition of N2O at low temperature over Co3O4 prepared by different methods

Microwave-induced Degradation of Chlorobenzene Using Fe0 and TiO2 Coated on Cordierites as Catalyst

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Decomposition of N₂O at low temperature over Co₃O₄ prepared by different methods